SKU: 24204323224

Holley 550-870K Sniper Stealth 4150 Self-Tuning Fuel Injection System Master Kit

Sale price$854.98 Regular price$949.98
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Ships within 48 hours · Estimated delivery Jul 29 - Aug 3

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Description

Holley 550-870K Sniper Stealth 4150 Self-Tuning Fuel Injection System Master KitOverview: The Sniper Stealth 4150 EFI system from Holley features 4, 100LB HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Sniper Stealth 4150 ECU is capable of fuel map self learning and ignition timing control, improving idle stability, drivability, and wide open throttle horsepower! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM

Overview:

The Sniper Stealth 4150 EFI system from Holley features 4, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Sniper Stealth 4150 ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications. Part # 34-42 is required for a bolt-in installation.

Features:

  • Bolt on 4150 Flange Carburetor Replacement
  • Throttle body mounted ECU - no extra boxes to mount
  • Supports up to 650hp with Four 100 Lb/Hr Injectors!
  • All of the wiring exits below the rear fuel injector cover, for a completely stealth installation.
  • Timed spark part for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor.
  • Air entry is machined to fit most stock style air cleaners with air cleaner locator provisions.
  • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
  • External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886.
  • Integrated ignition timing control
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
  • Self-tuning ECU means you don't have to be a computer/tuning wiz to have EFI!
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
  • OEM Style TPS/IAC and Fuel Pressure regulator, for years of dependable service.
  • Included clamp-on oxygen sensor kit for 2.25" exhaust ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange
  • Available in 3 finishes: Shiny, Black and coming soon, Gold

 

Application:

Year Make Model Submodel Engine Size
Universal

 

Specs:

Brand Holley Sniper EFI
CFM 870
Emission Code 3
Finish Shiny
Flange Style 4150
Fuel Pressure 58.5 PSI
Height 3.28"
Injector Size 100 lb/hr @ 58.5 PSI
Inlet / Outlet Size 3/4-16 Female O-Ring (AN 8)
MAP Sensor 2Bar
Max Horsepower Rating 650 Naturally Aspirated
Model 4150 EFI Conversion Throttle Body
Product Type Sniper Stealth EFI
Transmission 700R4/200R4
Transmission Ford C4/C6
Transmission TH350
Warning California Proposition 65
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 24204323224

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Amazon Customer
Natrona Heights, US
★★★★★ 5
Best Mushroom Coffee
Size: 28 Ounce (Pack of 1)
This coffee tastes good and gives me lasting energy at a great price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
K
Verified Purchase
Kindle Customer
Carnegie, US
★★★★★ 5
Love this coffee!
Size: 14 Ounce (Pack of 1)
I mix this into my regular coffee and it tastes great! I hate mushrooms and can’t taste the mushroom at all!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
B
Verified Purchase
B. B. Bess
Los Angeles, US
★★★★★ 4
Are mushrooms in this?
Size: 14 Ounce (Pack of 1)
I’m not sure mushrooms are in this. It has zero earthiness or creaminess to it, like other mushroom coffee I’ve had. I like it in that it’s organic and it dissolves well. The flavor of coffee is nice and strong
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Reviewed in the United States on March 5, 2026
K
Verified Purchase
Keah Burton
Carnegie, US
★★★★★ 5
So far so good
Size: 14 Ounce (Pack of 1)
Taste good, has a nice coffee taste. I like the amount you get, I was doing those expensive mushroom coffee brands, and this one gives you more for your money. They mostly taste the same but I like this one better. Will update with other benefits
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Reviewed in the United States on May 14, 2026
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Verified Purchase
L.A.
Omaha, US
★★★★★ 5
Never Thought I'd Drink Mushrooms!
Size: 14 Ounce (Pack of 1), Size: 14 Ounce (Pack of 1)
I've been wanting to try a mushroom coffee to see if I feel any benefits. It's only been maybe a week, week and a half, and haven't really felt any difference so far. However, one needs to give time and I'm willing to wait and see. Also, I am NOT a mushroom lover, and try to avoid them in my food. I do know they're good nutrition wise, so decided to see if I could stomach the taste. I chose this brand as it was much more cost effective than the other advertised brands, and I only use organic. The taste by itself is a bit bitter, but when cream is added as I usually do for my coffee (no sweetener for me), well, *wow*, it's absolutely delicious. Super happy with the flavor! In fact, I think about it often during the day when not drinking it! Will be buying more for sure. I bought the instant as it's so easy to pack around with me when traveling and road tripping.
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Reviewed in the United States on March 10, 2025

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